Photonic materials for high-temperature applications: Synthesis and characterization by X-ray ptychographic tomography
Photonic materials for high-temperature applications: Synthesis and characterization by X-ray ptychographic tomography
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DOI：
10.1016/j.apmt.2018.10.002
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发表时间：
2018-12-01
影响因子：
8.3
通讯作者：
Janssen, Rolf
中科院分区：
文献类型：
--
作者：
Furlan, Kaline P.;Larsson, Emanuel;Janssen, Rolf
用于高温应用的光子材料需要承受通常高于1000摄氏度的温度，同时保持其功能。当暴露于高温时，这种纳米结构材料容易发生有害的形态变化，然而光子材料的结构演化途径及其与材料功能损失的相关性尚未完全理解。在这里，我们使用高分辨率ptychographic X射线计算机断层扫描（PXCT）和扫描电子显微镜（SEM），以调查莫来石反蛋白石光子晶体的结构变化产生的非常低温（95摄氏度）原子层沉积（ALD）超循环过程。由高温暴露引起的3D结构变化被量化，并与陶瓷光子晶体的独特结构特征相关联。除了在通过粉末胶体悬浮液或溶胶-凝胶渗透产生的光子晶体中观察到的之外，在1400摄氏度的高温下，我们检测到从纳米孔到壳的质量传输方向。我们将这些不同的结构演化路径与基于ALD的反蛋白石光子晶体中空心顶点的存在联系起来。虽然烧结后周期性有序结构发生了畸变，但莫来石反蛋白石光子晶体在1400 ℃热处理100 h后仍呈现光子阻隙。(C)2018作者出版社：Elsevier Ltd
Photonic materials for high-temperature applications need to withstand temperatures usually higher than 1000 degrees C, whilst keeping their function. When exposed to high temperatures, such nanostructured materials are prone to detrimental morphological changes, however the structure evolution pathway of photonic materials and its correlation with the loss of material's function is not yet fully understood. Here we use high-resolution ptychographic X-ray computed tomography (PXCT) and scanning electron microscopy (SEM) to investigate the structural changes in mullite inverse opal photonic crystals produced by a very-low-temperature (95 degrees C) atomic layer deposition (ALD) super-cycle process. The 3D structural changes caused by the high-temperature exposure were quantified and associated with the distinct structural features of the ceramic photonic crystals. Other than observed in photonic crystals produced via powder colloidal suspensions or sol-gel infiltration, at high temperatures of 1400 degrees C we detected a mass transport direction from the nano pores to the shells. We relate these different structure evolution pathways to the presence of hollow vertexes in our ALD-based inverse opal photonic crystals. Although the periodically ordered structure is distorted after sintering, the mullite inverse opal photonic crystal presents a photonic stopgap even after heat treatment at 1400 degrees C for 100 h. (C) 2018 The Authors. Published by Elsevier Ltd.